Restorative Dentistry and Endodontics

The Korean Academy of Conservative Dentistry (대한치과보존학회)
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THE EFFECT OF ENVIRONMENT ON THE PHYSICAL PROPERTIES OF CORE MATERIALS

지대치 재료의 환경변화에 따른 물리적 성질에 관한 연구

  • Hwang, Yoo-Sook (Department of Conservative Dentistry, Division of Dentistry, Graduate School, Kyunghee University) ;
  • Choi, Kyoung-Kyu (Department of Conservative Dentistry, Division of Dentistry, Graduate School, Kyunghee University, Oral Biology Research Institute, College of Dentistry, Kyunghee University) ;
  • Park, Sang-Jin (Department of Conservative Dentistry, Division of Dentistry, Graduate School, Kyunghee University, Oral Biology Research Institute, College of Dentistry, Kyunghee University)
  • 황유숙 (경희대학교 대학원 치의학과 치과보존학교실) ;
  • 최경규 (경희대학교 대학원 치의학과 치과보존학교실, 경희대학교 치과대학 구강생물학연구소) ;
  • 박상진 (경희대학교 대학원 치의학과 치과보존학교실, 경희대학교 치과대학 구강생물학연구소)
  • Published : 2005.03.01
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Abstract

The purpose of this study was to measure the flexural strength and hardness of four core materials in 4 different medias and to evaluate the relationship between the physical properties. For the flexural strength, the specimens were prepared from each of the following materials: Bisfil Core, Core Max, Fuji IX GP, Miracle Mix and randomly divided into four groups and stored at 37 degree C in the following medias: distilled water for 24 hours (DW/1), distilled water for 30 days (DW/30). $2%$ NaF for 30 days (NF/30), 0.02N lactic acid for 30 days (LA/30). After storage, the specimens were subjected to flexural strength testing and calculated to flexural modulus. For hardness testing, specimens were prepared from four materials and storaged in the uniform way. After storage, the specimens were subjected to Vicker's hardness testing. 1. The flexural strength of Core Max were the highest, and the flexural strength of Miracle Mix were the lowest. 2. The hardness of Bisfil Core were the highest. 3. The hardness of Core Max were the highest. 4. The hardness of Miracle Mix were the lowest. 5. $2\%$ NaF and 0.02N lactic acid negatively affected the flexural strength and hardness of four core materials.

비금속 지대치 재료의 구강 내 환경변화에 따른 물리적 성질을 구명하기 위하여 4종의 지대치 재료를 다양한 환경에 보관한 후 굴곡강도 및 표면경도의 변화를 관찰하여 조건에 따른 영향을 구명하고자 이 연구를 시행하였다. Bisfil Core, Core Max, Fuji IX GP, Miracle Mix를 사용하여 굴곡강도 측정을 위한 시편을 제작한 후 최대하중을 측정하여 굴곡강도와 굴곡탄성계수를 계산하였다. 표면경도 측정을 위하여 아크릴릭 레진블럭에 상기 4종의 재료를 충전하여 중합시킨 후 순차 연마하여 경도측정을 위한 시편을 제작하고 Vickers hardness를 계산하였다. 1. 굴곡강도는 Core Max에서 가장 높고 Miracle Mix에서 가장 낮았다. 2. $37^{\circ}C$ 증류수에 24시간 보관한 군에서 Bisfil Core가 경도가 가장 높았다. 3. 30일 저장군에서는 Core Max가 경도가 가장 높았다. 4. 모든 군에서 Miracle Mix가 가장 낮은 경도를 나타냈다. 5. $2\%$ NaF용액과 0.02N lactic acid용액은 증류수보다 지대치 재료의 굴곡강도와 표면경도를 저하시켰다.

Keywords

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